There is a problem using section density as the key to how a bullet will penetrate. It is a clue, but not the key. First you have to look at the formula: Sectional Density = (Wt. in Grains/7,000) / (Dia.* Dia.). As you can see bullet construction is nowhere in the formula. It is only a relationship of weight to bullet diameter. This means you could have a bonded premium-hunting bullet with the same SD as a ballistic tip varmint bullet. Thus bullet construction actually has more bearing on actual performance in the field.